First, multiple-choice questions. (Please fill in the answer sheet, with 3 points for each question and 36 points for * * *).
1, as shown in figure: ∠ AOB = ∠ COD = 90,
∠AOD:? ∠ BOC = 5: 1, then ∠ ∠AOD is: (? )
60? b、 120
c、 150 D、 160?
2. If ∠ 1+∠ 2+∠ 3 = 180? What is impossible in ∠ 1, ∠2. ∠3 Yes: ()
A, there are two acute angles and a right angle. ?
B, two acute angles and an obtuse angle.
C has two obtuse angles and an acute angle.
D, all acute angles.
3. As shown in the figure, lines A and B intersect with line C, which can be
Judge? a‖b? The conditions are: ()
( 1)∠ 1=∠2,
(2)∠3=∠6,
(3)? ∠ 1=∠8,
(4)∠5+∠8= 180
a 、( 1)(3)? (2) and (4)?
c 、( 1)3)4)D 、( 1)2)3)4)
4, known ∠ mon = 30,? ∠ nop = 15, then ∠MOP is: ()
A, 45 B, 15 C, 45 or 15 D, uncertain.
5. Given that one side of two angles is on the same straight line and the other side is parallel to each other, the relationship between the two angles is: ()
A, equal b, complementary c, complementary? D, equality or complementarity?
6. The image with function y = 3x-2 has no ().
A, the first quadrant B, the second quadrant C and the third quadrant? D, quadrant four?
7. The following function Y is a proportional function of X: ()
a、y=3x2B、y=5-4x? c、y=xD、y=-6+x
8. There are two points (x 1, y 1) on the function y =-2x+3, (x2, y2) and x 1 < x2.
So the relationship between y 1 and y2 is:? ()
a、y 1>y2B、y 1=y2C、y 1